[Dovecot] Authentication Error Message formats

[Albert E. Whale]

I have been using UW's IMAP server and I am converting to Dovecot for
Maildir support.

When a user fails authentication, or a user does not exist, it appears
that the same message is used for these events.

Is there a way to indicate that the user does not exist (Invalid user),
and authentication Failure (Failed Password)?

Clearly these two failures indicate a different error in the system. 
One that some forgot their password, the other indicates a dictionary
attack.
-- 
Albert E. Whale, CHS CISA CISSP
Sr. Security, Network, Risk Assessment and Systems Consultant
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